Send packets to a specific outgoing interface for any destination not present in the routing table. Which command implements this behavior?

The set ip default next-hop command is used in a route-map to specify a default next-hop for packets that do not have a more specific route in the routing table. This effectively creates a "gateway of last resort" within the route-map logic. set ip next-hop specifies a next-hop for routes that do match the route-map criteria, not for all other destinations. set ip next-hop recursive is used when the next-hop itself needs to be looked up in the routing table. set ip next-hop verify-availability checks if the next-hop is reachable before using it. These options do not provide a default next-hop for any unmatched destination.